Intrabuilding and interbuilding length limitations :: | 9/55
| Maximum supportable length limitations are application and media dependent. Requirements The backbone length limitations include the total backbone channel length, including backbone cable, patch cords or jumpers, and equipment cables. When the horizontal cross-connect (HC) to intermediate cross-connect (IC) distance is less than maximum, the intermediate cross-connect (IC) to main cross-connect (MC) distance can be increased accordingly. However, the total distance from the horizontal cross-connect (HC) to the main cross-connect (MC) shall not exceed the maximum specified in column A below. Recommendations To minimize cabling distances, it is often advantageous to locate the main cross-connect near the center of a building or site. Cabling installations that exceed the standards distance limits may be divided into areas, each of which can be supported by backbone cabling within the scope of the standards. The length of category 3 multipair 100 Ohm backbone cabling, that supports applications up to 16 MHz, should be limited to a total of 90 m (295 ft). The length of category 5e multipair 100 Ohm backbone cabling, that supports data applications up to 100 MHz, should be limited to a total distance of 90 m (295 ft). The 90 m (295 ft) distance allows for an additional 5 m (16 ft) at each end for equipment cables (cords) connecting to the backbone. The 90 m (295 ft) distance limitation assumes uninterrupted cabling runs between cross-connects that serve equipment (i.e., no intermediate cross-connect).
Media Type | A | B | C
100 Ω cabling | <>800 m (2624 ft) | 300 m (984 ft) | 500 m (1640 ft)
62 µm cabling | 2000 m (6560 ft) | 300 m (984 ft) | 1700 m (5575 ft)
50 µm cabling | 2000 m (6560 ft) | 300 m (984 ft) | 1700 m (5575 ft)
singlemode | 3000 m (9840 ft) | 300 m (984 ft) | 2700 m (8855 ft)
The maximum length of cross-connect jumpers and patch cords in the main and intermediate cross-connections should not exceed 20 m (66 ft). The maximum length of cable used to connect telecommunications equipment directly to main or intermediate cross-connections should not exceed 30 m (98 ft).
Intrabuilding and interbuilding length limitations :: | 9/55